optimize blenderswap models for unity (mobile use)
As Duarte pointed out, there are no "easy" ways to optimize models for games - especially mobile games - efficiency is everything for mobile.  Most game models are built with a "budget" in mind, and every component of them - from the geometry to the textures to the rig and animations (if it has them) need to be carefully considered with that budget and  overall optimization in mind.  In my experience as a modeler (for games) high-resolution models can present a usable framework to build a low-poly version around and then maps and normals can be extracted - but it will be a very rare object that you will be able to use straight away.